iPhone 3GS don't start up

I have an iphone 3gs The antenne was not working anymore so i opened the phone. Put it together again and after an reset he started again. Because the antenne didn't work i opened it again. Now i have a real problem. The phone is not resseteble anymore. If i make connection with Itunes i get the quistion to type the 4 numbers code. But the display of the phone doesn't work. No apple logo. He only shines as an lamp.

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